TintNotes(TM) focus purely on the 9 notes included in the keys of C, G and F. These are the keys studied by beginners and primary aged children. For example: School xylophones play in these keys as extra F# and Bb keys are included with the instrument. Focusing on these 9 notes and having the colours easily differentiated gives the learner the chance to easily tell the difference between each note for the first time. These colours are close enough to use with Boomwhackers® and other matching instruments, and still have the advantage that children see clearly the difference between these important 9 notes.